On the night of September 12, Liang Weili, political commissar of Shenzhen Public Transport Branch, conveyed the preliminary investigation of the task force to the family of Yang Xu, one of the deceased. The reporter was present to attend. Liang Weili said that on the night of the incident, Yang Xu stabbed Wu with a knife because of a contradiction in his working relationship, and then took out an electric baton. Meanwhile, Wu shot and killed Yang Xu, and then committed suicide.